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首页> 外文期刊>Environmental Science & Technology >Energy and Greenhouse Gas Profiles of Polyhydroxybutyrates Derived from Corn Grain: A Life Cycle Perspective
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Energy and Greenhouse Gas Profiles of Polyhydroxybutyrates Derived from Corn Grain: A Life Cycle Perspective

机译：玉米籽粒中聚羟基丁酸酯的能量和温室气体分布：生命周期观点

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摘要

Polyhydroxybutyrates (PHB) are well-known biopolymers derived from sugars or vegetable oils. Cradle-to-gate environmental performance of PHB derived from corn grain is evaluated through life cycle assessment (LCA), particularly nonrenewable energy consumption and greenhouse gas emissions. Site-specific process information on the corn wet milling and PHB fermentation and recovery processes was obtained from Telles. Most of energy used in the corn wet milling and PHB fermentation and recovery processes is generated in a cogeneration power plant in which corn stover, assumed to be representative of a variety of biomass sources that could be used, is burned to generate electricity and steam. County level agricultural information is used in estimating the environmental burdens associated with both corn grain and corn stover production. Results show that PHB derived from corn grain offers environmental advantages over petroleum-derived polymers in terms of nonrenewable energy consumption and greenhouse gas emissions. Furthermore, PHB provides greenhouse gas credits, and thus PHB use reduces greenhouse gas emissions compared to petroleum-derived polymers. Corn cultivation is one of the environmentally sensitive areas in the PHB production system. More sustainable practices in corn cultivation (e.g., using no-tillage and winter cover crops) could reduce the environmental impacts of PHB by up to 72%.
机译：聚羟基丁酸酯（PHB）是衍生自糖或植物油的众所周知的生物聚合物。通过生命周期评估（LCA）评估源自玉米谷物的PHB从摇篮到大门的环境性能，尤其是不可再生能源消耗和温室气体排放。有关玉米湿磨，PHB发酵和回收过程的现场特定过程信息可从Telles获得。玉米湿磨，PHB发酵和回收过程中使用的大部分能源是在一个热电厂中产生的，在该热电厂中，玉米秸秆被认为是可以使用的多种生物质能的代表，被燃烧以发电和产生蒸汽。县级农业信息用于估算与玉米谷物和玉米秸秆生产相关的环境负担。结果表明，就不可再生能源消耗和温室气体排放而言，源自玉米籽粒的PHB在环境方面优于石油衍生的聚合物。此外，PHB提供了温室气体信用，因此与石油衍生的聚合物相比，PHB的使用减少了温室气体的排放。玉米种植是PHB生产系统中对环境敏感的领域之一。玉米种植中更具可持续性的做法（例如，使用免耕和冬季覆盖作物）可将PHB的环境影响降低多达72％。

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  • 来源
    《Environmental Science & Technology》 |2008年第20期|7690-7695|共6页
  • 作者

    SEUNGDO KIM; BRUCE E. DALE;

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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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